Gadu-Gadu Instant Messaging – GG.EXE
Gg.exe and spellchecker_gg.exe install with the Gadu-Gadu (Polish for "chit-chat") instant messaging client using a proprietary protocol. Gadu-Gadu is the most popular IM service in Poland, with over 7.8 million registered accounts and approximately 6.5 million users online daily. If you installed this program intentionally and enjoy using it, you can consider it safe. If you don't speak Polish and don't know what it's doing on your system, you can uninstall it via Control Panel or remove it using WinPatrol. You’ll find more information in English at http://en.wikipedia.org/wiki/Gadu-Gadu. For more information in Polish, visit http://www.gadu-gadu.pl/.
Safe
Gadu-Gadu